Specs and photos of the rumored Galaxy S III Mini have leaked out on the eve of Samsung’s launch event in Germany. According to German tech site MobileGeeks, the S III Mini will be a mid-range smartphone that is similar in design to its bigger brother at a fraction of the cost.

Leaked specifications indicate the Mini will ship with a 1GHz dual-core STE U8420 processor, 1GB of system RAM and 16GB of internal storage expandable via microSD card slot. The display is of the 4-inch Super AMOLED variety with a resolution of 800 x 480 pixels.

We’re also hearing that Samsung’s new smartphone will include Bluetooth 4.0, Wi-Fi, HSPA and NFC – all powered by a 1,500mAh battery. There’s a 5-megapixel camera on the rear that features auto-focus and LED flash. The front camera is said to be standard VGA quality.

The chassis will largely be constructed from lightweight plastic with measurements of 121.55 x 62.95 x 9.85mm. Android 4.1 Jelly Bean is expected to be the operating system of choice this time around.

Preliminary data suggests Samsung plans to sell the phone for 399 euros ($513) outside of contract. Carrier subsidies will likely bring this figure down to a more affordable level, however.

Unfortunately, the Galaxy S III Mini isn’t expected to be released in the US. Interested parties will either have to make do with the full-size Galaxy S III or try to obtain an international version of the SIII Mini for the time being. We’ll know the full details tomorrow following Samsung’s mobile event.